Write basic SQLite/rusqlite code

src/main.rs

@@ -1,3 +1,62 @@
-fn main() {
-    println!("Hello, world!");
+use rusqlite::{params, Connection, Result};
+#[macro_use]
+extern crate juniper;
+
+#[derive(Debug, GraphQLObject)]
+#[graphql(description="A comment on some content, such as a blog post.")]
+struct Comment {
+    author: Option<String>, // null is Anonymous
+    text: String
+}
+
+struct Database {
+    conn: Connection
+}
+
+impl Database {
+    fn new() -> Result<Self> {
+        let conn = Connection::open_in_memory()?;
+        conn.execute(
+            "CREATE TABLE comment (
+                id     INTEGER PRIMARY KEY,
+                author TEXT,
+                text   TEXT NOT NULL
+            )",
+            params![]
+        )?;
+        Ok(Self { conn })
+    }
+
+    fn get_comments(&self) -> Result<Vec<Comment>> {
+        self.conn
+            .prepare("SELECT author, text FROM comment")?
+            .query_map([], |row| {
+                Ok(Comment {
+                    author: row.get(0)?,
+                    text: row.get(1)?,
+                })
+            })?
+            .collect()
+    }
+
+    fn create_comment(&self, comment: &Comment) -> Result<()> {
+        self.conn.execute(
+            "INSERT INTO comment (author, text) VALUES (?1, ?2)",
+            params![&comment.author, &comment.text],
+        )?;
+        Ok(())
+    }
+}
+
+fn main() -> Result<()> {
+    let db = Database::new()?;
+    let comment = Comment {
+        author: Some("Elnu".to_string()), // None for anonymous
+        text: "This is a test comment by yours truly!".to_string(),
+    };
+    db.create_comment(&comment)?;
+    for comment in db.get_comments()?.iter() {
+        println!("Found comment {:?}", comment);
+    }
+    Ok(())
 }